How accurate is Birdsong's bird identifier?

It runs Google's Perch, a research-grade acoustic model covering nearly 15,000 species. When a call is ambiguous, we say so honestly and let you record a second clip to confirm, rather than guessing.

Is my recording stored?

No. Your audio is used to identify the bird in the moment and isn't saved to our servers. The birds you confirm are kept as cards in your own field journal; the recordings themselves are not.

Is the bird identifier free?

Yes — identify birds every day for free, no account required. Birdsong Pro ($3.99/mo or $39.99/yr) unlocks unlimited IDs, full field guides, your growing collection, and shareable Field Report cards.

Do I need an account or internet to identify a bird?

You'll need a connection to identify, since the AI runs in the cloud. No account is needed to try it — sign in with Google or email to save your field journal and sync it across devices.

Birdsong field guide

Black-bellied Storm-Petrel

Fregetta tropica

A small, wide-ranging pelagic seabird distinguished by a bold black midline stripe bisecting its white underparts.

What it sounds like

Usually silent at sea; at nesting sites, produces high-pitched, piping whistles and soft, rhythmic cooing.

Reference call, compare with what you heard

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Rec. 王自堃 · AntarcticaCC BY-NC-SA Xeno-canto

Field notes

Displays a unique 'kangaroo-hopping' foraging behavior, using its long legs to push off the water's surface while hovering.
The diagnostic black belly stripe is formed by elongated dark feathers, though this feature can be absent in some individuals due to moult or variation.
Strictly nocturnal at breeding colonies to avoid predation by opportunistic avian predators like skuas and gulls.
Possesses a highly developed olfactory system used to locate concentrated patches of crustaceans and squid in the open ocean.
Breeds in high-latitude subantarctic islands but migrates as far north as the tropical zone in all three major oceans.

Habitat

Pelagic open ocean; breeds in rock crevices, scree slopes, or peat burrows on remote islands.

Range

Circumpolar in the Southern Ocean, migrating north into the Atlantic, Indian, and Pacific Oceans during the austral winter.

Similar & commonly confused birds

New Caledonian Storm-PetrelFregetta lineata New Zealand Storm-PetrelFregetta maoriana White-bellied Storm-PetrelFregetta grallaria

Heard a Black-bellied Storm-Petrel?

Open Birdsong, tap record, and identify the bird singing near you in seconds — then collect it in your field journal.

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